Originally Posted by Globaliser

Which flight were you booked on? I can see BA84 YVR-LHR on 27 March 2019 is still in the availability displays and still showing 9s across all cash booking classes (according to EF) - and it is still bookable on ba.com. So the first thing to do would be to check that the email wasn't simply a mistake, and to ask whether the flight has actually been cancelled.

If, however, it is a YYC-LHR flight (as BA6501 surmises), then I think that this is the thread: Another 787 route casualty - Calgary route curtailed W18